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笼子和食物至少每两周更换一次，小笼下的托盘和水瓶至少每周更换一次。
cages and feeders were changed at least once every 2 weeks, and water bottles and trays under the cages were changed at least twice a week.
最后更新： 2012-11-11
使用频率： 2
质量：
1月7日，其后每两周一次
7 january, once every fortnight thereafter
最后更新： 2016-12-04
使用频率： 11
质量：